Device for converting rod throwing detonation into pressure detonation

Abstract

The utility model relates to a rod-throwing detonating device, in particular to a device for converting rod-throwing detonating into pressure detonating, and solves the problems that a rod-throwing exploder is replaced step by step, and resource waste is caused by the overstocked rod-throwing exploder. The device comprises the front-end connector and the rear-end connector which are in threaded connection, the mandrels are arranged in the front-end connector and the rear-end connector, when ball throwing and pressing are not carried out, the first through hole in the front-end connector is communicated with the second through hole in the mandrel, liquid in the sleeve enters the blind hole of the mandrel after passing through the first through hole and the second through hole, and at the moment, the internal pressure and the external pressure of the whole device are balanced; when the blocking ball is thrown through the oil pipe, the blocking ball seals the conical hole of the mandrel, then the pin is pressed to reach a shear value and is cut off, the pressure pushes the mandrel to move towards the rod throwing exploder, the mandrel impacts the rod throwing exploder, and detonation is completed.

Description

Technical Field

[0001] The utility model relates to a rod-throwing detonating device, in particular to a device for converting rod-throwing detonating into pressure detonating. Background Art

[0002] In the development of oil and gas fields, the perforation process is an indispensable link in the completion process, and the effect of perforation will directly affect the production capacity and life of the oil and gas wells.

[0003] The traditional perforating process uses a rod-throwing detonator as the detonating device. When perforating, the rod-throwing detonator is first set at a set position in the casing, and then the detonator is thrown into the casing from the wellhead. When the detonator hits the firing pin assembly of the rod-throwing detonator, the perforating gun is detonated to complete the perforating operation. With the rapid development of tubing transmission perforating technology and supporting product technology, the traditional rod-throwing detonator is gradually replaced due to backward technology. Nowadays, when perforating, the process of using a wellhead pump truck to pressurize and then using a pressure detonator to detonate the perforating gun is usually used. In order to achieve better perforating effects, a combination of a perforating detonator + a gunpowder delay device is used, and tubing is used as an interlayer to achieve multi-cluster detonation perforation, which greatly improves the perforating efficiency and quality. With the latest technological developments, new process technologies such as pressure-controlled electronic cluster perforation have emerged, which have taken the perforating efficiency and quality to a new level.

[0004] With the development of these advanced technologies and processes, drop-rod detonators have been gradually replaced, resulting in an inventory backlog of drop-rod detonators purchased in bulk by oilfield operating units, causing a great waste of resources. How to utilize the drop-rod detonators in stock under new process conditions has become a major problem currently faced by oilfield operating units. Utility Model Content

[0005] The utility model aims to solve the problem that the rod-throwing detonators are gradually replaced and the rod-throwing detonators in stock cause waste of resources, and to provide a device for converting the rod-throwing detonation into the pressure detonation, so that the rod-throwing detonators in stock can be utilized under the new process conditions.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A device for converting a rod-throwing detonation into a pressure detonation, which is arranged in a casing and is characterized by comprising a front end joint, a rear end joint, a core shaft, an outer shear sleeve, an inner shear sleeve and a pin;

[0008] The front end joint and the rear end joint are hollow structures, the rear end of the front end joint is located in the connecting threaded hole opened at the front end of the rear end joint and the two are connected by threads, the front end of the front end joint is used to connect with the oil pipe, the rear end of the rear end joint is used to connect with the rod detonator, and the core shaft is arranged inside the front end joint and the rear end joint;

[0009] A step hole is provided inside the rear end joint, and the small diameter hole of the step hole is located at the rear end of the rear end joint. The core shaft is a stepped shaft structure, and the diameter of its large diameter section is adapted to the inner diameter of the small diameter hole of the step hole. An inner shear sleeve is sleeved on the small diameter section of the core shaft, and one end of the inner shear sleeve abuts against the shoulder of the core shaft, and part of the outer wall of the inner shear sleeve abuts against the inner wall of the small diameter hole; the outer shear sleeve is sleeved on the outer wall of the inner shear sleeve, and one end of the outer shear sleeve abuts against the step surface of the step hole, and the outer wall of the outer shear sleeve abuts against the inner wall of the large diameter hole of the step hole; pin holes are radially provided on the inner shear sleeve and the outer shear sleeve, and the pins are arranged in the pin holes;

[0010] A blind hole is axially opened at the front end of the mandrel, the opening of the blind hole faces the front end of the front joint, a plurality of first through holes are radially opened on the outer wall of the front joint, and a second through hole is radially opened at a position corresponding to the first through hole on the outer wall of the large diameter section of the mandrel, and the second through hole is connected to the blind hole;

[0011] A conical hole is arranged at the blind hole opening of the core shaft, and a plugging ball is arranged in the conical hole for ball throwing and pressure through the oil pipe; the rear end of the core shaft is used to cut off the pin under the pushing action of pressure and then hit the rod throwing detonator to complete the detonation.

[0012] Furthermore, the front end joint includes a joint large diameter section and a joint small diameter section, the joint small diameter section is located at the rear end of the front end joint, and the joint small diameter section is provided with an external thread for cooperating with the connecting threaded hole, and a limiting boss is provided on the joint small diameter section; a limiting threaded hole is radially opened on the rear end joint, the limiting threaded hole is located between the limiting boss and the joint large diameter section, and a limiting screw is screwed into the limiting threaded hole, and the end of the limiting screw abuts against the outer wall of the joint small diameter section of the front end joint, so as to prevent the front end joint from detaching from the rear end joint.

[0013] Furthermore, a push rod is connected to the rear end of the core shaft, and the push rod is used to cooperate with the firing pin assembly in the rod-throwing detonator to complete detonation.

[0014] Furthermore, a first sealing ring is arranged between the limiting boss and the rear end joint, and a second sealing ring is arranged between the large diameter section of the core shaft and the inner wall of the large diameter section of the front end joint.

[0015] Furthermore, a limiting ring groove is provided on the outer wall of the large diameter section of the core shaft, an elastic limiting ring is compressed in the limiting ring groove, and the outer wall of the elastic limiting ring abuts against the inner wall of the small diameter section of the front end joint.

[0016] Furthermore, a docking threaded hole is provided on the rear end face of the core shaft, the push rod includes a main body and an external threaded section arranged at one end of the main body, an optical axis is arranged between the main body and the external threaded section, the outer diameter of the optical axis is smaller than the outer diameter of the external threaded section, the external threaded section and the optical axis are both located in the docking threaded hole, and the external threaded section cooperates with the internal thread of the docking threaded hole, and a thrust threaded hole is radially provided on the core shaft corresponding to the position of the optical axis, a thrust screw is screwed into the thrust threaded hole, one end of the thrust screw abuts against the outer wall of the optical axis to prevent the core shaft from detaching from the push rod.

[0017] Furthermore, the blocking ball is a steel blocking ball.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] (1) The utility model provides a device for converting a pitch-rod detonation into a pressure detonation, comprising a front end joint and a rear end joint, wherein the front end of the front end joint is connected to an oil pipe, and the rear end of the rear end joint is used to connect to a pitch-rod detonator. When the pitch-rod detonation is not pressed, the first through hole on the front end joint is connected to the second through hole on the core shaft, and the liquid in the casing enters the blind hole of the core shaft through the first through hole and the second through hole. At this time, the pressure inside and outside the entire device is balanced, and the pressures in the oil pipe and the casing are also balanced inside and outside. When a plugging ball is inserted through the oil pipe, the plugging ball will close the tapered hole of the core shaft. At this time, the pin is pressed to reach the shear value, the pin is cut off, and the pressure will push the core shaft to move in the direction of the pitch-rod detonator, so that the core shaft hits the pitch-rod detonator to complete the detonation. The device realizes the conversion of the pitch-rod detonation into pressure detonation. The working principle is simple. Under the new process conditions of pressure detonation, the backlog of the pitch-rod detonator inventory can be used in conjunction with it to consume the backlog of inventory and prevent waste of resources.

[0020] (2) The utility model provides a device for converting a pitch-rod detonation into a pressure detonation, and a push rod is connected to the rear end of the core shaft. The push rod is used to cooperate with the firing pin assembly of the pitch-rod detonator to complete the detonation. In this way, different push rods can be replaced to adapt to different firing pin assemblies, thereby improving the flexibility of the device.

[0021] (3) The utility model provides a device for converting a rod-throwing detonation into a pressure-throwing detonation, wherein a first sealing ring is arranged between the limiting boss and the rear end joint, and a second sealing ring is arranged between the large diameter section of the core shaft and the inner wall of the large diameter section of the front end joint, thereby enhancing the overall sealing effect.

[0022] (4) The utility model provides a device for converting a drop-rod detonation into a pressure detonation, in which a limit ring groove is provided on the outer wall of the large-diameter section of the core shaft, and an elastic limit ring is compressed in the limit ring groove. When the pin is sheared off, the core shaft moves in the direction of the drop-rod detonator. When the elastic limit ring is detached from the small-diameter section of the joint, the elastic limit ring springs open radially to limit the reverse movement of the core shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of an embodiment of a device for converting a rod-throwing detonation into a pressure detonation according to the utility model;

[0024] Figure 2 This is a schematic diagram of the cooperation between the outer and inner shear sleeves, the inner shear sleeve and the pin in the embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of an embodiment of the utility model in a wellhead unpressurized state;

[0026] Figure 4 It is a schematic diagram of an embodiment of the utility model in a state after wellhead pressure is applied.

[0027] The following are the descriptions of the reference numerals:

[0028] 1-front end joint, 101-joint large diameter section, 102-joint small diameter section, 103-first through hole; 2-blocking ball, 3-core shaft, 31-large diameter section, 32-small diameter section, 33-blind hole, 34-second through hole; 4-elastic limiting ring, 5-rear end joint, 51-step hole, 511-small diameter hole, 512-large diameter hole; 6-external shear sleeve, 7-pin, 8-internal shear sleeve, 9-thrust screw, 10-push rod, 1001-main body, 1002-external threaded section, 1003-optical axis; 11-first sealing ring, 12-limiting screw, 13-second sealing ring, 14-throwing rod detonator, 141-firing pin assembly. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Reference Figure 1-Figure 4 The utility model is a device for converting a rod-throwing detonation into a pressure detonation, which is arranged in a casing and comprises a front end joint 1 and a rear end joint 5, such as Figure 1As shown, the front end joint 1 and the rear end joint 5 are both hollow structures. The front end of the front end joint 1 is used to connect with the oil pipe, and the rear end of the rear end joint 5 is used to connect with the rod detonator 14. The front end joint 1 includes a joint large diameter section 101 and a joint small diameter section 102. The joint small diameter section 102 is located at the rear end of the front end joint 1, and an external thread is arranged on the joint small diameter section 102. A connecting threaded hole is opened at the front end of the rear end joint 5. The front end joint 1 and the rear end joint 5 are connected together by the cooperation of the external thread and the connecting threaded hole.

[0031] A core shaft 3 is arranged inside the front end joint 1 and the rear end joint 5. The core shaft 3 is a stepped shaft structure, including a large diameter section 31 and a small diameter section 32. A step hole 51 is arranged inside the rear end joint 5. The step hole 51 includes a small diameter hole 511 and a large diameter hole 512. The small diameter hole 511 of the step hole 51 is located at the rear end of the rear end joint 5. The diameter of the large diameter section 31 of the core shaft 3 is matched with the inner diameter of the small diameter hole 511, and an inner shear sleeve 8 is sleeved on the small diameter section 32 of the core shaft 3. Part of the outer wall of the inner shear sleeve 8 abuts against the inner wall of the small diameter hole 511 of the step hole 51, and one end of the inner shear sleeve 8 abuts against the shoulder position of the core shaft 3. An outer shear sleeve 6 is sleeved on the outer wall of the inner shear sleeve 8, and one end of the outer shear sleeve 6 abuts against the step surface of the step hole 51, and the outer wall of the outer shear sleeve 6 abuts against the inner wall of the large diameter hole 512 of the step hole 51, as shown in FIG. Figure 2 As shown, pin holes are provided in the radial direction on the inner shear sleeve 8 and the outer shear sleeve 6, and pins 7 are correspondingly provided in the pin holes.

[0032] A blind hole 33 is axially opened at the front end of the core shaft 3, and the opening of the blind hole 33 faces the front end of the front joint 1. In order to balance the internal and external pressures after the entire device enters the casing, four first through holes 103 are radially opened on the outer wall of the large diameter section 101 of the front joint 1, and four second through holes 34 are radially opened on the outer wall of the large diameter section 31 of the core shaft 3 corresponding to the four first through holes 103, and the second through holes 34 are connected with the blind holes 33. A tapered hole is arranged at the opening of the blind hole 33, and a steel plugging ball 2 is arranged in the tapered hole for ball injection and pressure injection through the oil pipe.

[0033] A push rod 10 is connected to the rear end of the core shaft 3. The push rod 10 is used to cooperate with the firing pin assembly 141 of the pitching detonator 14 to complete detonation. In order to facilitate the connection, the core shaft 3 and the push rod 10 are also connected by threads. A docking threaded hole is opened on the rear end face of the core shaft 3, and the external threaded section of the push rod 10 is screwed into the docking threaded hole.

[0034] Because the entire device needs to be lowered into the casing, once it falls off, it will cause accidents such as wellhead blockage. In order to prevent separation, two anti-separation structures are provided, including a first anti-separation structure that prevents the front end joint 1 from being separated from the rear end joint 5 and a second anti-separation structure that prevents the core shaft 3 from being separated from the push rod 10. The first anti-separation structure includes a limiting boss provided on the joint small diameter section 102, and a limiting threaded hole is radially opened on the rear end joint 5, the limiting threaded hole is located between the limiting boss and the joint large diameter section 101, and a limiting screw 12 is screwed into the limiting threaded hole, and the end of the limiting screw 12 abuts against the outer wall of the joint small diameter section 102 of the front end joint 1. In this way, even if loosening occurs, the limiting screw 12 will prevent loosening when it contacts the limiting boss, thereby preventing the front end joint 1 from being separated from the rear end joint 5.

[0035] The second anti-slip structure includes a thrust screw 9, and a docking threaded hole is opened on the rear end face of the core shaft 3. The push rod 10 includes a main body 1001 and an externally threaded section 1002 arranged at one end of the main body 1001. An optical axis 1003 is arranged between the main body 1001 and the externally threaded section 1002. The outer diameter of the optical axis 1003 is smaller than the outer diameter of the externally threaded section 1002. The externally threaded section 1002 and the optical axis 1003 are both located in the docking threaded hole, and the externally threaded section 1002 cooperates with the internal thread of the docking threaded hole. A thrust threaded hole is radially opened on the core shaft 3 corresponding to the position of the optical axis 1003, and a thrust screw 9 is screwed into the thrust threaded hole. One end of the thrust screw 9 abuts against the outer wall of the optical axis 1003. When looseness occurs and the externally threaded section 1002 is about to slip out of the docking threaded hole, the external thread of the externally threaded section 1002 will be limited by the thrust screw 9 to prevent it from slipping out.

[0036] In order to enhance the sealing effect of the entire device, a first sealing ring 11 is provided between the limiting boss and the rear end joint 5 , and a second sealing ring 13 is provided between the large diameter section 31 of the core shaft 3 and the inner wall of the large diameter section 101 of the front end joint 1 .

[0037] A limiting ring groove is provided on the outer wall of the large diameter section 31 of the core shaft 3, and an elastic limiting ring 4 is compressed in the limiting ring groove. The outer wall of the elastic limiting ring 4 abuts against the inner wall of the small diameter section 102 of the front end joint 1. The elastic limiting ring 4 is elastic. When the pin 7 is sheared off under pressure, the core shaft 3 will move toward the direction of the rod-throwing detonator. When the limiting elastic ring 4 escapes from the small diameter section 102 of the joint, the elastic limiting ring 4 bounces open radially to limit the reverse movement of the core shaft 3.

[0038] When using, first Figure 3As shown, the rear end connector 5 is connected to the rod-throwing detonator 14 and then lowered into the predetermined position in the casing, and the front end connector 1 is connected to the oil pipe. At this time, the entire device is in a state where wellhead pressure has not been applied, and the plugging ball 2 has not yet fallen into the tapered hole. The first through hole 103 is connected to the second through hole 34, and the liquid in the casing enters the blind hole 33 of the core shaft 3 after passing through the first through hole 103 and the second through hole 34. At this time, the internal and external pressures of the entire device are balanced, and the pressures in the oil pipe and the casing are also balanced inside and outside, so that the oil pipe is automatically filled with liquid during the process of the pipe string being lowered into the well. Because the internal and external pressures are balanced at this time, the pin 7 will not be subjected to too much external force at this time.

[0039] After the position is adjusted, the plugging ball 2 can be put in through the oil pipe, and the plugging ball 2 will close the tapered hole of the core shaft 3, and the oil pipe and the casing are no longer connected. At this time, the oil pipe is pressurized from the wellhead, and there is a pressure difference between the oil pipe and the casing. After the pressure is completed, the whole device is in Figure 4 In the state shown, the pressure difference causes the pin 7 to reach the shear value, the pin 7 is sheared, and the pressure will push the core shaft 3 to move toward the stick detonator 14. The core shaft 3 drives the push rod 10 to hit the firing pin assembly 141 to complete the detonation.

[0040] The device utilizes the existing new technology of pressure detonation, converts the traditional pitch rod detonation into pressure detonation, consumes inventory, reduces waste, and only the pin 7 and the sealing ring are consumable parts of the entire device, which can be replaced after use and can be reused many times.

[0041] The embodiments described above are merely descriptions of the specific implementation methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for converting a rod-throwing detonation into a pressure detonation, which is arranged in a casing and is characterized by: It comprises a front end joint (1), a rear end joint (5), a core shaft (3), an outer shear sleeve (6), an inner shear sleeve (8) and a pin (7); The front end joint (1) and the rear end joint (5) are hollow structures, the rear end of the front end joint (1) is located in a connecting threaded hole opened at the front end of the rear end joint (5), and the two are connected by threads, the front end of the front end joint (1) is used to connect to the oil pipe, and the rear end of the rear end joint (5) is used to connect to the rod-throwing detonator (14), and the core shaft (3) is arranged inside the front end joint (1) and the rear end joint (5); The rear end joint (5) is provided with a stepped hole (51) inside, the small diameter hole (511) of the stepped hole (51) is located at the rear end of the rear end joint (5), the mandrel (3) is a stepped shaft structure, the diameter of the large diameter section (31) thereof is matched with the inner diameter of the small diameter hole (511) of the stepped hole (51), an inner shear sleeve (8) is sleeved on the small diameter section (32) of the mandrel (3), one end of the inner shear sleeve (8) is in contact with the shaft shoulder of the mandrel (3), and the inner shear sleeve (8) is provided with a plurality of inner shear sleeves (8). Part of the outer wall of the shear sleeve (8) abuts against the inner wall of the small-diameter hole (511); the outer shear sleeve (6) is sleeved on the outer wall of the inner shear sleeve (8), one end of the outer shear sleeve (6) abuts against the step surface of the step hole (51), and the outer wall of the outer shear sleeve (6) abuts against the inner wall of the large-diameter hole (512) of the step hole (51); pin holes are radially provided on the inner shear sleeve (8) and the outer shear sleeve (6), and the pins (7) are arranged in the pin holes; A blind hole (33) is axially provided at the front end of the mandrel (3), the opening of the blind hole (33) faces the front end of the front joint (1), a plurality of first through holes (103) are radially provided on the outer wall of the front joint (1), and a second through hole (34) is radially provided on the outer wall of the large diameter section (31) of the mandrel (3) at a position corresponding to the first through hole (103), and the second through hole (34) is connected to the blind hole (33); A conical hole is arranged at the opening of the blind hole (33) of the core shaft (3), and a plugging ball (2) is arranged in the conical hole for ball throwing and pressure injection through an oil pipe; the rear end of the core shaft (3) is used to cut off the pin (7) under the driving action of pressure and then hit the rod throwing detonator (14) to complete detonation.

2. The device for converting the rod-throwing detonation into the pressure-throwing detonation according to claim 1, characterized in that: The front end joint (1) comprises a joint large diameter section (101) and a joint small diameter section (102), the joint small diameter section (102) being located at the rear end of the front end joint (1), and the joint small diameter section (102) being provided with an external thread for cooperating with a connecting threaded hole, and a limiting boss being provided on the joint small diameter section (102); a limiting threaded hole is radially provided on the rear end joint (5), the limiting threaded hole being located between the limiting boss and the joint large diameter section (101), and a limiting screw (12) is screwed into the limiting threaded hole, the end of the limiting screw (12) being in contact with the outer wall of the joint small diameter section (102) of the front end joint (1), so as to prevent the front end joint (1) from being separated from the rear end joint (5).

3. The device for converting the rod-throwing detonation into the pressure-throwing detonation according to claim 2, characterized in that: The rear end of the core shaft (3) is connected to a push rod (10), and the push rod (10) is used to cooperate with a firing pin assembly (141) in a stick-throwing detonator (14) to complete detonation.

4. The device for converting the rod-throwing detonation into the pressure-throwing detonation according to claim 3, characterized in that: A first sealing ring (11) is provided between the limiting boss and the rear end joint (5), and a second sealing ring (13) is provided between the large diameter section (31) of the core shaft (3) and the inner wall of the large diameter section (101) of the front end joint (1).

5. The device for converting the rod-throwing detonation into the pressure-throwing detonation according to claim 4, characterized in that: A limiting ring groove is provided on the outer wall of the large diameter section (31) of the core shaft (3), an elastic limiting ring (4) is compressed and arranged in the limiting ring groove, and the outer wall of the elastic limiting ring (4) abuts against the inner wall of the joint small diameter section (102) of the front end joint (1).

6. The device for converting the rod-throwing detonation into the pressure-throwing detonation according to claim 5, characterized in that: A butt-jointed threaded hole is provided on the rear end face of the core shaft (3); the push rod (10) comprises a body (1001) and an externally threaded section (1002) arranged at one end of the body (1001); an optical axis (1003) is provided between the body (1001) and the externally threaded section (1002); the outer diameter of the optical axis (1003) is smaller than the outer diameter of the externally threaded section (1002); the externally threaded section (1002) and the optical axis (1003) are both located in the butt-jointed threaded hole, and the externally threaded section (1002) matches the internal thread of the butt-jointed threaded hole; a thrust threaded hole is provided radially on the core shaft (3) corresponding to the position of the optical axis (1003); a thrust screw (9) is screwed into the thrust threaded hole; one end of the thrust screw (9) abuts against the outer wall of the optical axis (1003) to prevent the core shaft (3) and the push rod (10) from being separated.

7. The device for converting stick-throwing detonation into pressure detonation according to claim 1, characterized in that: The blocking ball (2) is a steel blocking ball.

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